Hi,
I am working on a series of blog posts that will explain the Rules module in details.
Regarding your question:
If the Rule should apply all items under a certain working-copy - you can provide a simple condition, such: SourceName = 'thename'.
Notice that, in the condition textbox - you can right click and see a list of available fields.
If the files you wish to monitor are under a certain folder under a certain Source (which means - not all files under a Working-Copy should trigger the Rule), then you can use a condition like:
ItemFilePath like '%path1/path2/%' which actually means: "files that have path1/path2/ part of their full path".
For example, if your working-copy is "c:\project", and you want the Rule to be triggered for all files under: "c:\project\web\", then your condition should be: ItemFilePath like '%c:\project\web\%'
That was the condition part, now comes the Action part.
Notice that, if you have the Evaluation or the Professional version, you can right-click a Source and select "Monitor -> Email Notification". It will create the condition for you and add an Email action. You will have to fill all the SMTP information.
In the Rule dialog, add an Action of type SMTP Email or GMail.
Fill in the details and save it.
Try committing something and see how the Action is triggered.
I hope it helps, you are welcome to keep asking for any additional help you require.
I'm sorry for the lack of documentation. I am still working on it.
Regards,
Adrian